Bellarmine is primarily remembered for his involvement in the persecution of Galileo, despite this being a minor episode in his extensive career as a defender of the Catholic faith and a leading intellectual of the Counter-Reformation.
Bellarmine was a central figure in the Counter-Reformation, serving as a cardinal, prolific polemicist against Protestantism, and a key intellectual in shaping the relationship between the church and state.
Bellarmine controversially denied that the Pope wielded any temporal or secular power, advocating for indirect papal authority. This was to safeguard the absolute superiority and transcendence of spiritual authority over worldly affairs.
Bellarmine actively supported the burning of heretical books and the execution of heretics, arguing that it protected others from insidious influence and saved heretics from prolonging their error. He also drew up an index of forbidden works in 1592.
Bellarmine emphasized the importance of traditional interpretations and the divinely guided tradition of exegesis, arguing that human ingenuity alone was insufficient to interpret scripture with full confidence.
Bellarmine believed that certain biblical passages presupposed a geocentric universe, and without a watertight proof, he could not accept the Copernican model. He argued that the church could not remain neutral on matters that had implications for biblical interpretation.
Bellarmine argued that political authority was established by the consent of the governed and was rooted in natural law. He rejected the idea that divine grace was necessary for legitimate political rule, asserting that humans were competent to arrange their political affairs within the natural law.
Bellarmine's theory allowed secular rulers to govern without direct papal interference, but the Pope could intervene in temporal affairs for spiritual reasons, such as when a ruler required adherence to heretical teachings.
Bellarmine's 'Controversies' was a monumental anti-Reformation theology that cited Protestant authors 7,135 times to refute their arguments. It became a target of numerous Protestant refutations and was even denounced to the Pope by Sixtus V.
Bellarmine argued that while it is true that one cannot compel sincere belief, the state still punishes actions like adultery. He saw heresy as a profound threat to the church's harmony and authority, justifying harsh measures against heretics.
Though most famous for his role in persecuting Galileo, Robert Bellarmine was a central figure of the Counter-Reformation, especially in his political thought.